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  • Cited by 6
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    This article has been cited by the following publications. This list is generated based on data provided by CrossRef.

    Padilla, Abraham J. and Gualda, Guilherme A.R. 2016. Crystal-melt elemental partitioning in silicic magmatic systems: An example from the Peach Spring Tuff high-silica rhyolite, Southwest USA. Chemical Geology,

    Cashman, Katharine V. and Giordano, Guido 2014. Calderas and magma reservoirs. Journal of Volcanology and Geothermal Research, Vol. 288, p. 28.

    Baker, D.R. Mancini, L. Polacci, M. Higgins, M.D. Gualda, G.A.R. Hill, R.J. and Rivers, M.L. 2012. An introduction to the application of X-ray microtomography to the three-dimensional study of igneous rocks. Lithos, Vol. 148, p. 262.

    Bachmann, O. Miller, C.F. and de Silva, S.L. 2007. The volcanic–plutonic connection as a stage for understanding crustal magmatism. Journal of Volcanology and Geothermal Research, Vol. 167, Issue. 1-4, p. 1.

    Gualda, Guilherme A. R. and Ghiorso, Mark S. 2007. Magnetite scavenging and the buoyancy of bubbles in magmas. Part 2: Energetics of crystal-bubble attachment in magmas. Contributions to Mineralogy and Petrology, Vol. 154, Issue. 4, p. 479.

    Gualda, Guilherme A.R. and Rivers, Mark 2006. Quantitative 3D petrography using x-ray tomography: Application to Bishop Tuff pumice clasts. Journal of Volcanology and Geothermal Research, Vol. 154, Issue. 1-2, p. 48.

  • Earth and Environmental Science Transactions of the Royal Society of Edinburgh, Volume 95, Issue 1-2
  • March 2004, pp. 375-390

Fragmentation, nucleation and migration of crystals and bubbles in the Bishop Tuff rhyolitic magma

  • Guilherme A. R. Gualda (a1), David L. Cook (a1), Rahul Chopra (a1), Liping Qin (a1), Alfred T. Anderson (a1) and Mark Rivers (a2)
  • DOI:
  • Published online: 01 July 2007

The Bishop Tuff (USA) is a large-volume, high-silica pyroclastic rhyolite. Five pumice clasts from three early stratigraphic units were studied. Size distributions were obtained using three approaches: (1) crushing, sieving and winnowing (reliable for crystals >100 μm); (2) microscopy of ∼1 mm3 fragments (preferable for crystals <100 μm); and (3) computerised X-ray microtomography of ∼1 cm3 pumice pieces.

Phenocryst fragments coated with glass are common, and the size distributions for all crystals are concave-upward, indicating that crystal fragmentation is an important magmatic process.

Three groups are recognised, characterised by: (1) high-density (0·759–0·902 g cm−3), high-crystal content (14·4–15·3 wt.%) and abundant large crystals (>800 μm); concave-downward size distributions for whole crystals indicate late-stage growth with limited nucleation, compatible with the slow cooling of a large, gas-saturated, stably stratified magma body; (2) low-density (0·499 g cm −3), low-crystal content (6·63 wt.%) and few large crystals; the approximately linear size distribution reveals that nucleation was locally important, perhaps close to the walls; and (3) intermediate characteristics in all respects.

The volumetric fraction of bubbles inversely correlates with the number of large crystals. This is incompatible with isobaric closed-system crystallisation, but can be explained by sinking of large crystals and rise of bubbles in the magma

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Earth and Environmental Science Transactions of The Royal Society of Edinburgh
  • ISSN: 1755-6910
  • EISSN: 1755-6929
  • URL: /core/journals/earth-and-environmental-science-transactions-of-royal-society-of-edinburgh
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